<template> 
  <el-container class="home-container">
      <!-- 头部区域 -->
    <el-header>
      <div class="home-header-box">
        <img src="../assets/heima.png" alt="">
        <span>电商管理后台</span>
      </div>
      <el-button type="info" @click="logout">退出</el-button></el-header>
    <!-- 内容区域 -->
    <el-container>

      <el-aside :width="isCollapse ? '64px':'200px'">

       <div class="toggle-button" @click="toggleCollapse">|||</div>
       <!-- 侧边栏菜单区域 -->
           <el-menu 
      background-color="#333744"
      text-color="#fff"
      active-text-color="#409eff"
       unique-opened
       :collapse="isCollapse"
       :collapse-transition="false"
       :router="true"
       :default-active="activePath"
       >

       <!-- 一级菜单区域 -->
      <el-submenu :index="item.id + ''" v-for="item in menulist" :key="item.id">
        <!-- 一级菜单模板区域 -->
        <template slot="title">
         <!-- 图标 -->
          <i :class="iconObj[item.id]"></i>
          <!-- 文本 -->
          <span>{{item.authName}}</span>
        </template> 
         <!-- 二级菜单区域 -->
          <el-menu-item :index="'/' + subItem.path" 
            v-for="subItem in item.children" 
            :key="subItem.id"
            @click="saveNavState('/' + subItem.path)"
            >
              <template slot="title">
                <!-- 图标 -->
                  <i class="el-icon-menu"></i>
                  <!-- 文本 -->
                  <span>{{subItem.authName}}</span>
                </template> 
          </el-menu-item>
      </el-submenu>
    
    </el-menu>
      </el-aside>
      <el-main>
           <!-- 路由占位符 -->
           <router-view></router-view>
      </el-main>
    </el-container>
</el-container>

</template>

<script>
export default { 
  data(){
    return {
      //  左侧菜单数据
      menulist:[],
      iconObj:{
        '125':'iconfont icon-user',
        '103':'iconfont icon-tijikongjian',
        '101':'iconfont icon-shangpin',
        '102':'iconfont icon-danju',
        '145':'iconfont icon-baobiao',
      },
      // 是否折叠菜单
      isCollapse:false,
      // 被激活的链接地址
      activePath:''
    }
  },
  created(){ 
    this.MenuList()
    this.activePath = window.sessionStorage.getItem('activePath');
  },
  methods: {
    // 退出
    logout() {
      window.sessionStorage.clear()
      this.$router.push('/login')
    }, 
    // 获取所有的菜单
    async MenuList(){ 
        const { data: res } = await this.$http.get('menus') 
        // console.log(res)
        if(res.meta.status !== 200) return this.$message.error(res.meta.msg);
        this.menulist = res.data
    },
    // 点击按钮 切换菜单都折叠与展开
    toggleCollapse(){
      this.isCollapse = !this.isCollapse
    },
    // 保存链接的激活状态
    saveNavState(activePath){
      window.sessionStorage.setItem('activePath',activePath)
      this.activePath = activePath
    }


  }
}
</script>

<style scoped>
.home-container{
  height: 100%;
}
.el-header{
  background-color: #373d41;
  display: flex;
  justify-content: space-between;
  padding-left: 0;
  align-items: center;
  color:#fff;
  font-size: 20px;
}
.home-header-box{
  display: flex;
  align-items: center;
}
.home-header-box>span{
  margin-left: 15px;
}
.el-aside {
  background-color: #333744;
}
.el-aside .el-menu{
  border-right: none;
}
.el-main{
  background-color: #eaedf1;
}

.iconfont{
  margin-right: 10px;
}

.toggle-button{
  background-color: #4A5064;
  font-size: 12px;
  line-height: 24px;
  color: #fff;
  text-align: center;
  letter-spacing: .2em;
  cursor: pointer;
}
</style>
